Deep dredging device



Sept. 19, 19 7 T. JEREMIASEN DEEP DREDGING DEVICE 4 Sheets-Sheet 1 Filed Sept. 20, 1965 MIKE/v70? Sept. 19, 1967 T. JEREMIASEN DEEP DREDGING DEVICE 4 Sheets-Sheet 2 Filed Sept. 20, 1965 70% flaw/05m Sept. 19, 1967 T. JEREMIASEN DEEP DREDGING DEVICE 4 Sheets-Sheet 3 Filed Sept. 20, 1965 Sept. 19, 1967 T. JEREMIASEN DEEP DREDGING DEVICE 4 Sheets-Sheet 4 Filed Sept. 20, 1965 [MENTOR-- ORE U EREM/HSEN United States Patent 3,342,356 DEEP DREDGING DEVICE Tore Jeremiasen, Sodra Klockpselsvagen 15B, Malmo V, Sweden Filed Sept. 20, 1965, Ser. No. 488,312 Claims priority, application Sweden, Sept. 25, 1964, 11,506/64 4 Claims. (Cl. 214-138) This applciation is a continuation-in-part of my copending application Ser. No. 440,742 filed Mar. 18, 1965.

Devices hitherto known for deep dredging on traction cable dredgers consist of -a jib supported by one end on the rotatable machine cabin of a dredger mounted on an undercarriage with belts or rubber tyred wheels, while a shaft bearing a dredger shovel is mounted on the other end and can be pivoted in a vertical plane. The dredger device is operated by a traction cable in one or two stringers and in general by means of a winding cable in two or more stringers. The traction cable is affixed to the lower end of the shovel shaft and is drawn over a deviating pulley (or a pair of deviating pulleys) provided on the jib into a position in the vicinity of the bearing point of the jib on the machine cabin. As a result of this arrangement of the deviating pulley and of the position which the traction cable is thereby caused to assome in relation to the point at which the shovel shaft is articulated to the jib, a relatively considerable dredging force is obtained, enabling effective dredging to be carried out in the horizontal and diagonal directions. Under certain circumstances, however, this position of the cable can result in serious disadvantages, as it renders it impossible to excavate from drainage ditches or similar places in roadways, in which intersecting electricity supply and telephone cables and other conduits usually occur, these being liable to suffer damage from the traction cable. In operations of this kind, therefore, use has hitherto been made of special dredgers (hydraulic dredgers) operating vertically, which do not suffer from the aforementioned drawbacks but with which, on the other hand, it is not possible to effect efficient horizontal or diagonal dredging.

The object of the present invention is to provide a dredging apparatus for traction cable dredgers, of which the sphere of applicability will be considerably extended by means of a device enabling the position of the deviating pulleys on the jib to be adjusted as desired.

The invention is mainly characterized by the fact that the jib is provided with a displaceable slide on the shaft of which are mounted two deviating pulleys for a shovel shaft traction cable and which can be operated by means of a double acting hydraulic cylinder, a pneumatic cylinder, a worm, or a similar device.

If effective horizontal dredging is to be carried out, therefore, the deviating pulleys are adjusted to a position as close as possible to that end of the jib which is connected with the machine cabin. If, on the other hand, it is desired to dredge in the vertical direction and thus to ensure that the traction cable will not come in contact with any lines or conductors and thus damage them, then the deviating pulleys are moved as far as possible towards the other end of the jib.

The invention provides that a shovel adjustable by means of a double acting hydraulic cylinder can be provided on the shovel shaft. The jib can be connected with the machine cabin by means of a hydraulic cylinder movable in a vertical plane, while finally, the jib can be raised and lowered together with the aforementioned parts mounted on it, by means of a winding cable. These measures provide a dredger which can operate horizontally and diagonally with considerable dredging power "ice and also vertically with the same degree of effectiveness as a vertical dredger (hydraulic dredger).

The accompanying drawings provide schematic diagrams of a constructional example of the invention.

In these drawings:

FIG. 1 is a side view of the dredger.

FIG. 2 is a longitudinal section, on a larger scale, through the rear zone of the jib, in accordance with the line A-A of FIG. 5.

FIG. 3 is a cross section along the line BB of FIG. 2.

FIG. 4 is a cross section along the line CC of FIG. 2.

FIG. 5 is a plan view of the jib as shown in FIG. 1.

FIG. 6 is a side view of the dredger with the shovel in the working position, when dredging in ground in which intersecting electricity and telephone cables (E, T) are laid.

FIG. 7 is a side view of a part of a dredge jib with a slide operated by a worm.

FIG. 8 is a section along the line VIIIVIII in FIG. 7.

The dredger is provided with an undercarriage with belts or rubber tyred wheels 6, surmounted by a rotatable machine cabin 2, in which is mounted the machinery with the operating devices etc.

The device for deep dredging consists of a jib attached by one end to the machine cabin 2, while a shovel shaft 3 is pivotably mounted on a horizontal shaft at the other end.

A dredging shovel 4 is mounted on a horizontal shaft on the shovel shaft 3 and can be pivoted by means of a double acting hydraulic cylinder 5. The cylinder 5 can be replacedby a fixed support, so that the dredging shovel 4 is rigidly connected to the shovel shaft 3. In the version illustrated, the shovel shaft 3 is operated by a traction cable 7, which is secured in the lower zone of the shaft 3 and runs over deviating pulleys 8 on a cable drum, and also by a winding cable 9. A hydraulic cylinder 10 is mounted between the jib 1 and the machine cabin 2 and can be blocked when required, a firm connection thus being obtained between the jib" 1 and the machine cabin 2, so that owing to part of the weight of the dredger itself the shovel tooth exerts a particular force in a downward direction.

Each deviating pulley 8 is supported at one end on a shaft 11 which in its turn is rigidly supported on a slide which moves on two slide bars 13 on the respective two sides of the jib 1. The slide 12 with the shaft 11 and the deviating pulleys can be moved along between its extreme positions A (FIG. 1) and B (FIG. 6) by means of a chain 14 or similar device which runs over two sprockets 15 mounted on the jib 1 and which is afiixed both to a mounting plate 16 on the slide 12 and to a piston in a double acting hydraulic cylinder 17, in order to provide the apparatus for deep dredging with the dredging properties mentioned in the foregoing. The cylinder 17 can be replaced by a pneumatic cylinder, by a screw spindle engaging a fixed nut on the slide, or by a similar device. According to FIGS. 7 and 8, the dredge jib 1 is provided with bearings 20 for a threaded spindle 21 operated by a hydraulic motor 21A and passing through two nuts 22 mounted on the bottom of the slide 16, which carries the shaft 11 for the pulleys 8, the slide being steered and carried by two guide rails 23.

I claim:

1. A device for deep dredging comprising:

(a) a jib supported at one end on a rotatable machine cabin of a dredger mounted on an under-carriage;

(b) a shaft carrying a dredger shovel mounted on the other end pivotable in a vertical plane, the dredger jib being provided with a displaceable slide having a shaft on which are mounted two pulleys adapted to displace vertically a traction cable running from the shovel shaft to a hoisting ,drumyand (0) means for power shifting said slide.

2. A device for deep dredging comprising:

(a) a jib supported at one end on a rotatable machine cabin of a dredger mounted on an undercarriage;

(b) a shaft carrying a dredger shovel mounted on the other end pivotable in a vertical plane, the dredger jib being provided with a displaceable slide having a shaft on which are mounted two pulleys adapted to displace vertically a traction cable running from the shovel shaft to a hoisting drum; and

(c) means for power shifting of said slide, said means comprising a hydraulic cylinder.

3. A device for deep dredging comprising:

(a) a jib supported at one end on a rotatable machine cabin of a dredger mounted on an undercarriage;

(b) a shaft carrying a dredger shovel mounted on the other end pivotable in a vertical plane, the dredger jib being provided with a displaceable slide having a shaft on which are mounted two pulleys adapted to vertically displace a traction cable running from the shovel shaft to a hoisting drum; and (c) means for power shifting of said slide, said means comprising a screw spindle and a nut.

4. A device for deep dredging comprising:

(a) a jib supported at one end on a rotatable machine cabin of a dredger mounted on an undercarriage;

(b) a shaft carrying a dredger shovel mounted on the other end pivotable in a vertical plane, the dredger jib being provided with a displaceable slide having a shaft on which are mounted pulleys adapted to displace a traction cable running from the shovel shaft to a hoisting drum; and

(c) means for power shifting said slide, said means comprising a hydraulic cylinder pivotally mounted on the dredger jib and provided with a piston rod, the outer end of which is connected with an endless member running over stationary pulleys on the dredger jib, and said displaceable slide being incorporated into said endless member.

References Cited UNITED STATES PATENTS 1,840,550 1/1932 Wilson 214-138 3,021,023 2/1962 Soyland et al. 2l4l38 3,184,084 5/1965 Hollander 214---134 HUGO O. SCHULZ, Primary Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,342,356 September 19, 1967 Tore Jeremiasen It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the heading to the printed specification, lines 3 and 4, for "Tore Jeremiasen, Sodra Klockpselsvagen 15B, Malmo V, Sweden" read Tore Jeremiasen, Malmo V, Sweden, assignor to Aktiebolaget Landsverk, Industrigatan, Landskrona, Sweden, a body corporate of Sweden Signed and sealed this 11th day of March 1969.

(SEAL) Attest:

EDWARD J. BRENNER Edward M. Fletcher, Jr.

Commissioner of Patents Attesting Officer 

1. A DEVICE FOR DEEP DREDGING COMPRISING: (A) A JIB SUPPORTED AT ONE END ON A ROTATABLE MACHINE CABIN OF A DREDGER MOUNTED ON AN UNDERCARRIAGE; (B) A SHAFT CARRYING A DREDGER SHOVEL MOUNTED ON THE OTHER END PIVOTABLE IN A VERTICAL PLANE, THE DREDGER JIB BEING PROVIDED WITH A DISPLACEABLE SLIDE HAVING A SHAFT ON WHICH ARE MOUNTED TWO PULLEYS ADAPTED TO DISPLACE VERTICALLY A TRACTION CABLE RUNNING FROM THE SHOVEL SHAFT TO A HOISTING DRUM; AND (C) MEANS FOR POWER SHIFTING SAID SLIDE. 